To be fair to outsiders, http://llvm.org/docs/LangRef.html http://llvm.org/docs/LangRef.html is linked from the main page where the human-readable IR format is

To be fair to outsiders, http://llvm.org/docs/LangRef.html http://llvm.org/docs/LangRef.html is linked from the main page where the human-readable IR format is referred to as "LLVM assembly language", and with the in-memory representation listed as an equivalent form but not with particular privilege.